Abrasive-wheel dresser



-March 1 1 1924.;

H. K. SPENCER ABRASIVE WHEEL DRESSER 2 sheets-sheet 2 Filed May lO, 1921 UH NU Patented Mar. 1l, T924.

agarrar aerien.'

HENRY K. SPENCER, OF WATER/TOWN, MASSACHUSETTS, ASSIGNOE TO THE BLA??- OEARD MACHINE COMPANY, OF CAMBRIDGE, MASSACHUSETTS, A. CORPORATIDE QF ,s l CHUSETTS.

ABBASIVE-WHEEL DRESSER.

Application led May 10, 1921. Serial No.46, 2 52.

To all whom it may concern.'

Be it known that I, HENRY K. SPENCER, a citizen of the United States, and a resident of Watertown, in the county of Midd dlesex and State ofMassachusetts, have invented an Improvement in Abrasive-Wheel Dressers, of which the following descr1ption, in connection with the accompanying drawings, is a specification, like characters l@ on the drawings representing like parts.

This invention relates to surface grinding machines, and is more particularly concerned with a dresser for Ithe abrasive wheel, and a method of using the dresser during the grinding operation. The invention has special application to a vertical spindle surface grinder of the type which is the subject matter of United States Letters Patent No. 1,182,861, issued to me May 9th, 1916, to which reference may be h ad for details not shown here.

The invention will be best understood by reference to the following description, when taken in connection with the accompanying E drawings of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings:

Fig. 1 is a plan partly in horizontal section of apportion of a grinding machine equipped with a wheel dresser exemplifying my invention;

Fig. 2 is an elevation of the same; and

Fig. 3 is a detail sectionalview on line 3--3 of Fig. 2.

Referring to the drawings, and to the embodiment of the invention which is selected for exemplication, there is shown a portion of a grinding machine having a vertical column 4 presenting guides 6 for aA wheel head 8, which carries an abrasive wheel 10, herein annular in form, mounted for rotation about a vertical aXis lengthwise of the travel of the head. The latter also carries a safety guard 12, which encircles the wheel. The lower end of the wheel operates on the work, and the latter is suitably held on a face plate 13, shown in Fig. 1.

1n the present embodiment, the dresser comprises a set of toothed, hardened steel cutters 14, mounted to rotate on a pin 16 and carried by suitable means permitting the same to travel across the working surace of the wheel. In the present example, this means is a swinging arm 18'suitably secured to a vertical shaft 20, the latter being mounted to turn in a long bearing 22 presented by a bracket 24, the latter being of the arm in aninward direction.

The dresser is adjustable in a direction transverse to its travel when traversing the working surface of the wheel. This is conveniently accomplished in the present instance by providing an adjusting nut 32 having lscrew-threaded engagement with the shaft 20, and resting upon a collar 34 which in turn rests upon the bearing 22. The collar is fixed against rotation with respect to the shaft, as by a screw 36 presenting a key 38 received in a key-way 40 extending lengthwise of the shaft, whereby the latter is free to slide vertically with respect to the collar, while still held against turning movement with relation thereto. lWhen, therefore, the adjusting nut 32 is turned in the proper direction, the shaft will be raised or lowered as the case may be, and the cutters 1a adjusted in a direction normal to the working surface of the wheel.

An important feature of my invention is the fact that the dresser can be operated without interrupting the grinding. This is due to the relative location of the dresser, the wheel and the face-plate, it being observed by reference to Fig. 1 that the path of the cutters across the face of the wheel is entirely outside the periphery of the faceplate. If it is observed that the wheel is becoming glazed and not cutting as freely as desired, all that it is necessary'to do is to bring the dresser into action by adjusting it to the proper height, and then swinging it to and fro across the working face by the use of the handle provided for that purpose. This furnishes a quick, safe Way for dressing or sharpening the wheel, and

it accomplishes the necessary rou hening Vof the wheel face with a minimum oss of the abrasive material.

Having thus described one embodiment of my invention, but without llmiting myself thereto, what I claim and deslre by lLetters Patent to secure is:

` horizontal end face during the grinding operation, comprising a dresser mounted to travel horizontally across and beneath the laterally projecting portion of said end face.

2. In a vertical grinding machine, the combination of a horizontal work-support, a vertical abrasive wheel having a lower, horizontal end face which operates on the u per side of Work held on the upper face o? said work-support and having a portion which projects laterally beyond the margin of said worksupport, a support which carries said wheel vertically toward and from said work-support, and means also carried by said wheel-support for dressing said lower, horizontal end face, comprising a dresser carried by said support and mounted to travel horizontally across and beneath the laterally projecting portion of said end face.

3. In a vertical s indle grinding machine, the combination ofp a work-su port having a horizontal face which is adapted to receive the work, a grinding wheel mounted to rotate about an approximately vertical axis and having a lower end face which projects A laterally beyond the margin of said worksupport and is adapted to operate on said work, and means for dressing said end face, comprising a dresser carried by said support` and mounted to travel across the laterally projecting portion of said end face.

4. In a grindin machine, the combination of a rotatable ace-plate and an abrasive wheel arranged eccentrically with relation to each other and having faces perpendicu' lar to their axes, the face of said plate receiving the work thereon and the face of said wheel operating on the work, a carrier which carries said wheel axially, and a wheel dresser'also carried by said carrier disposed outwardly beyond the margin of said faceplate and mounted to move from without the perimeter of said wheel across the working face thereof.

5. In a grinding machine, the combination of a rotatable face-plate and an abrasive wheel arranged eccentrically with relation to each otherr *and* having faces perpendicular to their axes, the face of said plate receiving the work thereon and the face of said wheel operating on the work, a carrier which carries said wheel axially, and a wheel dresser also carried by said carrier pivoted eccentrically with relation to said face-plate to swing across the working face of said wheel.

6. In a grinding machine, the combination of a rotatable face-plate and an abrasive Wheel arranged eccentrically with relation to each other and having faces perpendicular to their axes, the face of said plate receiving the work thereon and the face of said wheel operating on the work, a carrier which carries said wheel axially, and a wheel dresser also carried by said carrier pivoted to swing about an axis without the margin of said face-plate and to travel across the working face of said wheel.

7. In a grinding machine, the combination of a rotatable face-plate and an abrasive wheel arranged eccentrically with relation to each other and having faces perpendicular to their axes, the face of said plate receiving the work thereon and the face of said wheel operating on the work, a guard about the perimeter of said wheel, a wheel dresser disposed outwardly beyond the margin of said face-plate and mounted to move from .without the perimeter of said wheel across the working face thereof, and means cooperating with said guard outwardly beyond said perimeter to limit the inward movement of said wheel dresser and to prevent interference of said wheel dresser with said face-plate.

8. In a grinding machine, the combination of a rotatable face-plate and an abrasive wheel arranged eccentrically with relation to. each other and having faces perpendicular to their axes, the face of said plate receiving the work thereon and the face of said wheel operating on the work, a wheel dresser disposed outwardly beyond the margin of said face-plate and mounted to move from without the perimeter of said wheel across the working face thereof, and means outwardly beyond said perimeter to limit the inward travel of said wheel dresser with reference to the perimeter of said faceplate.

9. In a grinding machine, the combination of an abrasive wheel', a travelling wheel head on which said wheel is mounted for rotation about an axis lengthwise of the travel of said head, a wheel dresser, a shaft on which said wheel dresser is mounted to swing about an axis substantially parallel with the axis of rotation of said wheel, and sc rew means for adjusting said shaft length wise.

10. In a rinding machine, the combination of an arasive wheel, a travelling wheel msaeaa head on which said wheel is mounted for rotation about an axis lengthwise of the travel of said head, a wheel dresser, a shaft by which said wheel dresser is carried about an axis substantially parallel with the axis means at the other end of said shaft for turnin said shaft about its axis.

12. n a grinding machine, the combination of an abrasive wheel having a working surface transverse to its axis, a wheel head on which said wheel is mounted for rotation, a wheel dresser, an arm carrying said wheel dresser, a shaft to which said arm is secured, a bearing carried by said head and in which said shaft is mounted to turn about an axis parallel with the axis of said wheel, a handle secured to said shaft to turn the latter and carry said arm and dresser to and fro, means to limit swinging movement of said arm, an adjusting nut threaded onto said shaft to adjust the latter lengthwise in said bearing, and a collar interposed between said nut and bearing and having splned connection with said shaft.

13. In a grinding machine, the combination of an abrasive wheel, a support therefor, a wheel dresser, a shaft by which said wheel dresser is carried across an end face of said wheel about an axis substantially parallel with the axis of said wheel, and means for causing lengthwise movement of aid shaft to urge said dresser against said ace.

14. In a grinding machine, the combination of an abrasive wheel, a support therefor presenting a bearing substantially parallel with the axis of said wheel, a shaft journaled in said bearing, two arms which are carried by said shaft and project in different directions therefrom, and a dresser carried by one of said arms across an end face of said wheel.

15. In a vertical spindle grinding machine, the combination of an abrasive wheel the lower end face of which operates on the work, a wheel head which carries said wheel vertically, a shaft carried by said wheel head and having its axis disposed lengthwise of the axis of said wheel, and a wheel dresser carried by said shaft across said face.

16. In a vertical spindle grinding machine, the combination of an abrasive wheel the lower end face of which operates on the work, a wheel head which carries said wheel vertically, a lateral wheel guard carried by said wheel head and terminating at its lower end above said face, and a wheel dresser supported by said wheel head for swinging movement transversely beneath the lower end of said wheel uard and across said lower end face of said wheel.

In testimony whereof, I have signed my name to this specification.

HENRY K. SPENCER. 

